The rest of it is not saved but it is possible that 'Oh Snow-white' is a Westron translation or variation of this aerlinn. Variations of this hymn are sung throughout the book, such as the very last one written down:

...and as if in answer, from down below, coming up the road out of the valley, voices sang:

A! Elbereth Gilthoniel!

silivren penna míriel

o menel aglar elenath,

Gilthoniel, A! Elbereth!

We still remember, we who dwell

In this far land beneath the trees

The starlight on the Western Seas

Donald Swann wrote music for this song, which can be found in the book The Road Goes Ever On, as well as on the accompanying CD of the latest version. A different musical version was recorded by the Tolkien Ensemble. The first version cited above can be found on their album A Night in Rivendell, and takes the form of a chant sung by a female soloist. The second version can be found on the album At Dawn in Rivendell.